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// Copyright 2013 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Only works on systems with syscall.Close.
// We need a fast system call to provoke the race,
// and Close(-1) is nearly universally fast.
// +build darwin dragonfly freebsd linux netbsd openbsd plan9
package runtime_test
import (
"runtime"
"sync"
"sync/atomic"
"syscall"
"testing"
)
func TestGoroutineProfile(t *testing.T) {
// GoroutineProfile used to use the wrong starting sp for
// goroutines coming out of system calls, causing possible
// crashes.
defer runtime.GOMAXPROCS(runtime.GOMAXPROCS(100))
var stop uint32
defer atomic.StoreUint32(&stop, 1) // in case of panic
var wg sync.WaitGroup
for i := 0; i < 4; i++ {
wg.Add(1)
go func() {
for atomic.LoadUint32(&stop) == 0 {
syscall.Close(-1)
}
wg.Done()
}()
}
max := 10000
if testing.Short() {
max = 100
}
stk := make([]runtime.StackRecord, 100)
for n := 0; n < max; n++ {
_, ok := runtime.GoroutineProfile(stk)
if !ok {
t.Fatalf("GoroutineProfile failed")
}
}
// If the program didn't crash, we passed.
atomic.StoreUint32(&stop, 1)
wg.Wait()
}
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